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Wyszukujesz frazę "chemical adsorption" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Activated carbons from common nettle as potential adsorbents for CO2 capture
    Autorzy:
    Szymańska, Alicja
    Skoczek, Amelia
    Przepiórski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/778957.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    activated carbon
    common nettle
    CO2 adsorption
    chemical activation
    Opis:
    Activated carbons (ACs) prepared from common nettle (Urtica Dioica L.) were studied in terms of carbon dioxide adsorption. ACs were prepared by KOH chemical activation in a nitrogen atmosphere at temperatures (ranging from 500 to 850°C). The pore structure and the surface characterization of the ACs were specified based on adsorption-desorption isotherms of nitrogen measured at –196°C and carbon dioxide at 0°C. The specific surface area was calculated according to the BET equation. The pore volume was estimated using the DFT method. The highest values of the specific surface area (SSA) showed activated carbons produced at higher carbonization temperatures. All samples revealed presence of micropores and mesopores with a diameter range of 0.3–10 nm. The highest value of the CO2 adsorption, 4.22 mmol/g, was found for the material activated at 700°C.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 1; 59-66
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bio-polishing sludge adsorbents for dye removal
    Autorzy:
    Zaini, M. A. A.
    Norulaina, A.
    Mohd Azizi, C. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/779794.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    adsorption
    adsorbent
    bio-polishing sludge
    methylene blue
    chemical treatment
    Opis:
    The objective of this work is to evaluate the removal of methylene blue dye by bio-polishing sludge-based adsorbents. The adsorbents were characterized according to the specific surface area, pH upon the treatment and surface functional groups. The adsorption of dye was carried out at room temperature, and the adsorption data were analyzed using the isotherm and kinetics models. The bio-polishing sludge is rich in ash content, and the presence of surface functional groups varied with the treatment strategies. The specific surface area of adsorbents is between 7.25 and 20.8 m2 /g. Results show that the maximum removal of methylene blue by sludge adsorbents was observed to have the following order: untreated sludge (SR) > zinc chloride-treated (SZ) > microwave-dried (SW) = potassium carbonate-treated (SK) > acid-washed (SH). The maximum adsorption capacities for SR and SZ as predicted by the Langmuir model are 170 and 135 mg/g, respectively. Although SR demonstrates a higher maximum removal than SZ, the latter exhibits greater removal intensity and rate constant even at high dye concentration. The bio-polishing sludge is a promising adsorbent for dye wastewater treatment.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 4; 15-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of textural and chemical characteristics of activated carbons on phenol adsorption in aqueous solutions
    Autorzy:
    Vargas, D. P.
    Giraldo, L.
    Moreno-Piraján, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/779420.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    activated carbon monoliths
    phenol adsorption
    textural and chemical characteristics
    immersion calorimetry
    Opis:
    The effect of textural and chemical properties such as: surface area, pore volume and chemical groups content of the granular activated carbon and monoliths on phenol adsorption in aqueous solutions was studied. Granular activated carbon and monolith samples were produced by chemical activation. They were characterized by using N2  adsorption at 77 K, CO2  adsorption at 273 K, Boehm Titrations and immersion calorimetry in phenol solutions. Microporous materials with different pore size distribution, surface area between 516 and 1685 m2  g−1  and pore volumes between 0.24 and 0.58 cm3  g−1  were obtained. Phenol adsorption capacity of the activated carbon materials increased with increasing BET surface area and pore volume, and is favored by their surface functional groups that act as electron donors. Phenol adsorption capacities are in ranged between 73.5 and 389.4 mg · g−1 .
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 4; 87-93
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The simplex optimization for high porous carbons preparation
    Autorzy:
    Sreńscek-Nazzal, J.
    Michalkiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/779821.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    węgiel porowaty
    aktywacja chemiczna
    metoda simplex
    adsorpcja metanu
    porous carbon
    chemical activation
    simplex method
    methane adsorption
    Opis:
    The microporous carbon materials were prepared by chemical activation of Polish coal with potassium hydroxide using the simplex design method for planning the experiments. The experimental parameters were varied to identify the optimum conditions. Coal can be an excellent starting material for the preparation of high porous carbons for natural gas storage. The porosity of the resultant carbons was characterized by nitrogen adsorption (-196oC). Methane adsorption was investigated in a volumetric laboratory installation at range pressures from 1 to 3.5 MPa (25oC). The best results of methane storage capacity (557 cm3 . g-1) were obtained when using an impregnation ratio 3.41/1 KOH/precursor and temperature at 592oC, (SLANG = 2091 m2 . g-1). The parameters of the preparation of high porosity and high methane adsorption carbon were determined by a fast and simple method.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 4; 63-70
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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